This is an electronic ignition conversion kit for 25D4 distributor for negative ground cars. Fits MG Midgets, MGA, and MGB through 1974. Everything you need to convert to electronic ignition. Better performance and never change points again. These fit negative ground cars only! These are for 25D distributors and many cars have been converted to the later 45D distributors and they use a different kit. So be sure to check what is in the car. Most 25D distributors have 25D on the top cast into the housing near the vacuum advance. If you have a question as to which distributor you have please inquire and we can help. Please note you will receive a brand new kit in a sealed box. Because these kits are easily ruined if wired backwards, no returns if the box is opened. Kit is under warranty from Accuspark in the UK and it will be the buyer's responsibility to make a warranty claim directly with Accuspark if there is a problem which is very unlikely if properly installed.